Automatic pin trimmer



Feb. 8, 1927. LORENZ T AL I AUTOMATIC PIN TRIMMER Filed April 192 2 Sheets-Sheet 1 ,Z/ 20 I a 5 l ,fl llf 512 55 Lara 72 E2771] 212122515 .FSZZZYJEPE 551. 2

Feb. 8,1927. 1,616,909

- c. LORENZ ET AL v AUTOMATIC PIN TRIMMER Filed April 9. 1926 2 Sheets- Sheet 2 a5 5 /5 /5 )0 )1 a 1 7 I :1

g S M1 I 4 f Afi' ,a/ 50 m 5 l I z 5 1 Q 4. 25 I /j w f h j E 271] .ii'zzz'zz i fi V Hefner E 552/? Patented Feb. 8, 1927. v

. UN TED ST TES onnnnns LORENZ, EMI; KUNIsn, AND DELMER E. snrrz', or'ivrnnrirowoo, isconsin.

- AU MAT Q 111;

V Application filed. April 9,

This invention relates to pintrimming 'mach-ines. j

Qje'cts of this invention are to, provide a Vmachine adapted for the trimmingof the bases ofpins usedin bowling alleys so't jlat although the pins may become irregular on their bottoms, nevertheless, they may be V {11 one end and maybe provided with a, fbuffing' or polishing wheel 12' at" its other. end. Preferably, a saw guard 13 positioned over the upper portion of the 's'awand 1 lid-amped about a portion oftfhe'motor, for

quickly trimmedand restored to their correct condition. I

More specifically, this invention has for its objectthe provision of "a machine which may be accuratelyset'to trim the pins to a I predeterminedextent, andwhich maybe so adjusted that the "axis'of the pin Wlll be held at right angles to the plane of the saw Further objectsa-re to provide a compact machine which is of simple and strong construction, and which may be very readily operated, provision being made for automatically locking the pin in place by the manipe ulatinghandle for the pin carriage.

' An embodiment of the invention is shown in the accompanying drawings, in which V Figure 1 is a plan view of the apparatus.

Figure 2 is a side elevation thereof.

Figure 3 is a sectional view approximatev 1y on the line'-8-3 of Figure 1.

Figure 4 is a sectional View approximately on the line 44 of Figure 1, such view showing, however, the carriage in retracted position'.

Figure 5 is a sectional View on the line 55 of Figure. 2.

Referring tothe drawings, it will be seen that the. machine comprises a main frame consisting of two rectangular portions 1 and which are integrally formed. A pair of guiding rods 3 are carried by the rectangular portion 2 and a pair of guiding rods 4L are carried by the rectangular portion 1. Preferably these guiding rods are each provided 7 with threaded ends which pass through apertures in the frame and are provided with nuts on their outer ends so that the rods'may be rigidly locked in place.

The machine is provided with an electric motor 5 which is mounted upon a motor base 6 provided with outwardly projecting apertured ears 7 slidably mounted upon the rods 3. Further, this motor base is provided with a central ear or depression 8 through which an elongated screw 9 is threaded. This screw'is provided with a manlpulatlng head 10 at its rear end and extends through the rear portionof the frame 2 as shown most iege. ser al n 109,850,]

* in F s r Further, it is tojbe noted chat the screw is provideclwithshoulderslso that it may notf'slip axially with refe erence'to the frame 2. Consequently, adjustment of the screw moves the motorforw'ardly or rearwardly upon the supporting rods 3 g T emotor isprovided with a circular saw exanple, the forward hefirjlllg, as shown in Figures 2' and '3. 7

' A pin' carriage 1 4 is provided. with aperi- 7 0 'tured ears "15 which "slide upon the rods 4 as shownmost clearlyinFigures 2 and 4:.

This pin carriage is provided with an 'up.

standing head or gauged-member '16 at its outer end, and is further providedwith a v shaped saddle portion 17 at its inner end adapted to receive the body portion ofthe pin 18. The head of the pin is received in V a small saddle portion 19 located adjacent the gauging head 16. This saddle portion is provided with a squared shank 20 which passes through a correspondingly apertured boss 21 extending downwardly from beneath the carriage 14:. It is adapted for adjustment vertically and may be locked in place by means of the set screw 22see Figures 2 and 5.

It will be seen, therefore, that the axis of the pin may be accurately adjusted so that it is exactly perpendicular to the plane of the saw. r

In order to hold the pin firmly in place,

and also to provide a manipulating handle a manipulating handle 25 so that the operator may clamp the pin firmly in place by means of the handle 25, and also, may advance the carriage towards the saw.

It is to be noted particularly that the greatest accuracy may be obtained by this machine, and after an initial adjustment has been made, any number of pins may be rapidly sawed to provide a fiat-bottom at exact right angles to the axis of'the pm.

It will be seen that an extremely simple and serviceable machine has beenprovided,

and one Which may be very rapidly operated. 7

It Will beseen further that simple and reliable means have been providedfor aocu racy gauging the cut so that all of thepins p machine for trimming the bases of bowl-l; f mg pins comprising a; base irame, avpair. oftgii V 1 may be similarly trimmed.

Further,-. it is to benoted that the utmost ease of adjustment-is afforded, and that the amount of trimming may be adjustedto any value desired.

Although the invention hasbeen' described in considerable detail,., such description is intended as illustrative rather, than limiting as the invention may be variously embodied and asthe scope of such invention is to be determined as claimed.

We claim:

guiding rods carried by said base frame, a motor slldably supported by said rodst an elongated screw for advancing said motor,

a saw directly carried by the shaft of said motor, a second pair of guiding rods carried by said frame'and mounted at right angles to said first pair of rods, a carriage slidably mounted upon said second pair of guiding rods, said carriage having a saddle for receiving the body of the pinsandhaving an adjustable saddle for receiving the head of the pins a gauging lug' projecting upwardly from said carriage and adapted to contact with the'he'ad ofthe pin, and a clamping member for looking the pins to the carriage; 7 I In testimony that We claim the foregoing We have hereunto set'our hands at Mani-V towoc, in the county of Manitowoc and State of lVisconsin.

CHARLES LORENZ. .EMIL KUNISI-L' V "DELMER SEITZ. 

